In desperation I crated a new page, rebuilt everything from scratch while deleting the components on the old page.
I then shut down PSOC Creator and spun it back up again.
After that everything built up just fine.
The workaround for this issue is Closing and opening the PSoC Creator.
This issue may be related to machine specific with the available memory in the system.
I basically have a gaming machine (i7-4770K with 16GB of RAM) .
I'll check the system resources if this happens again.
Thanks for the tip!